Archibald Simpson migrated Scotland to Adelaide, South Australia

Archibald Simpson migrated Scotland to Adelaide, South Australia

Archibald married Isabella Ross (either before or after migration). They had 2 daughters Margaret born 24th Aug 1840, Emily Montgomery born 19th July, 1842 and perhaps a son, Alexander born 1842 or 1843. I cannot find any immigration records for immigrants into Adelaide, S.A.Does anybody know if they may have disembarked in Western Australia or Melbourne Vic?